Arrays
What is 4 rows times 6?
24
2x10
20
22x5
110
Estimate 7 x 31
210
Isabelle has 9 ant farms. Each ant farm has 99 ants.
Which of the following shows a reasonable estimate of how many ants Isabelle has?
A) 7 × 125 = 875
B.) 8 × 110 = 880
C.) 9 × 100 = 900
D.) 10 × 100 = 1,000
C
How much is 8 rows times 10?
80
4x50
200
34 x3
102
Estimate 5 x 790
4000
Miriam can put 28 books on a shelf. What is the best estimate of the amount of books she can put on 8 shelves?
A) 300 books
B) 260 books
C) 240 books
D) 160 books
C
How much is 6 rows times 20 ?
120
9x400
3600
Which partial product will help you find the product 4 x 205?
a) 4 x20 and 4x5
b) 4 x200 and 4 x50
c) 4x2 and 4x 50
d)4 x200 and 4x5
Estimate 6 fourth grade classes with 28 students in each class. About how many kids are there in total?
180
In Omar's school, there are 8 fourth-grade classrooms. Each classroom has about 22 students. Which is a reasonable estimate of the number of fourth graders in Omar's school?
A) 160 because 8 × 22 is about 8 × 20 = 160
B) 180 because 8 × 22 is about 9 × 20 = 180
C) 200 because 8 × 22 is about 8 × 25 = 200
D) 300 because 8 × 22 is about 10 × 30 = 300
A
How much is 8 rows times 30?
240
To find 3 x 800, multiply 3x8 then add how many zeros?
2
Which is the same as 7 x 57?
a) 35 + 49
b) 350 +49
c) 350 + 490
d) 7 + 57
B
What is the best estimate to 6 x 68?
6 x 70 which is 420
Each of the 109 fourth graders will need 3 notebooks this school year.
What is the total number of notebooks the fourth graders will need this year?
327 notebooks
A shark has 3 rows of teeth. If the shark has 100 teeth in each row, how many teeth does it have in total?
300
Michelle wrote a whole number ending in 4 zeros. If she multiplies the number by 10, how many zeros should be in the product?
5
99 x 6
594
A box of pens holds 196 pens. There are 6 full boxes of pens in the school supply room. Which number sentence shows the best way to use rounding to estimate the total number of pens in the school supply room?
200 x 6 =1,200
The high school marching band has 339 band members. Each band member is asked to pay $8 for transportation. How much is the amount of money collected to pay for band transportation?
$2,712